Features of UO
Obsidian
Stat Cap 295
Max Stat 176 (although varies from time to time lol)
Skill Cap 680 - 780 (although again varies)
Max Skill 100 (Grandmaster)
Real UO
Stat Cap 225
Max Stat Whatever u want it to be (although 225 kinda sux)
Skill Cap 700 (note: The longer you play the bigger your cap is)
Max Skill 125 (Legendary)
As you can see from some of the examples above Obsidian has been changed massivley and some of it is for the better (specially the spell polymorph), however one thing obsidian will always beat any other server at is the community
Have fun mate